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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad94cb5b3b36e543869edc17423d5c4c260847f625d00635ae020d4ad1a03c8' 
  AND token = 'bd6RZwhBM83DLQwnNcyLHEoO9dsnouJ0SOTQeL2md1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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