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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8972964931b4c80bac88cc887ae9dc646b961c8a80a77c1087048af5e8964a35' 
  AND token = 'ZOM9/WZbqq38CQ2u+rG1Xx7KbeAnd91J+GvbxE/Dyi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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