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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be5e00bed70c797b3c1381ee2bb91070a4214278abdfcab32fb4c1d12f892ca' 
  AND token = 'rnnYHs3eEEtvXL9387Va0pt26np0565GS1iE02FT5CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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