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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f77c5392096006722a712ec75410be89494a2102955791aea2c503a62477e4' 
  AND token = '3bfScVsMiAs7O2fMF82LMnpIn1DKd8lE8MOnt5lQw8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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