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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0660ddca1c4849e449490e8b509493079e7aeb1c7d57914a8e3ce97d6a2f9e7d' 
  AND token = 'f8JWhU+5m2cXRfiL84oLPiSUmaYhg81wgiK2cREPMYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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