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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5490ca3ba81aa6eee7f173c4d20d286d911fbe20607bb18826a86c140e528692' 
  AND token = '8njgpgIpfG/7kDktup4b2Fm41NUxhlV39vGJrNX5cnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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