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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b39e9508664b597b1e610d933eba0f4748b1295b1cae63bc1fdcdad142d9df' 
  AND token = 'AvnaLBzvH6iSnqYF8SCb3Qdcn7Y5xNI/a84DPKEAWtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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