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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738755ca642e12c5d7425292443ecc62f5f7e391d0ae157d587280a748c766ef' 
  AND token = 'A01GME95D6hLsf8KGF6Ag01BQ7jlzESj6y+ElSMTES4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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