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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0914cee80fa08e7cd7351223a3879bc8799ba45ff912d0e474fa3ad95e74000' 
  AND token = 'J8pn7FQv03Uc6Q07q2mQ8ZxPiyK7TM9csvIsoiCTqYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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