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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297de08cbd02478e3ef2db5303d9e30e9f0091c067d43f453560315ce5984f36' 
  AND token = 'yo3e0MuVJ/628oVT/iFf1G7OyVQl0BunuXZVkxHi4VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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