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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a204b1268a07b57fb4788116943a6a607dfa08c5a6431d128b8d32625fd6739' 
  AND token = 'KwAhKuOC3RBHnb0MP4Ciwbal7yLOXZVllfYtMLmV4hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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