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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0dd96c676908490932b0fac63cf939f8df8420f9e5bc9203c6034ab4bd8f63' 
  AND token = 'j8v0vLh0PGh3Pfb8g4CW2AbnTOybfdqGTfjZLLH0+Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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