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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920214bbc52859b79c7581e1e32cdd0c1f5dd87d852a620fb426ebc6c15e615f' 
  AND token = 'mlsRVTlBJRfKI7oI74AteLQgg8RddUaAhglLbUfVJMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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