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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1a1daf9b20fc5d25fd73346a67f1cfdc885b25d7f252a30c05dfd37918cf55' 
  AND token = 'fj9lKT4aQ0EtcwTkOmmiev90y+JH3FjrLh6QzUHCu04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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