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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3236339964fd4a9d1b2894dd6d6d0c90ad2430e2d4671971ce32ae357699cb69' 
  AND token = 'o8GhwYPD9LDFVt5HKQ4q3CtHFIY2hsfoDUuqEJRuNaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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