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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ad318acd34942261f88cfe69079ac462b60d02aed567e36833d626a4ba9d76' 
  AND token = 'lMgdx0bfDXHpo1+4G8wtCF2FGxzd6eE/mVIz1Y4ajOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}