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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5a073644bd5bb097bc9e6631e6cf8d04db528f37df47e339df9724346e0113' 
  AND token = 'yngrgCVH6P2syQjko1L2zM4tNdMELqf8YvTDAksd1sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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