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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67249e3a7267d800cdfa82196ef2d8132f6eaa29f3f1ddcb294e23624ab6e9c' 
  AND token = 'lIY/WaVUb0J1NF02C/c4yMhZGx7NqGH4fBBGGPHc0ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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