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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f4e2620e80c058456002148a05eb3584dd639774ce7efe7feefe286149876c' 
  AND token = 'ch1bJEyIZzhTiud18hTxP1JSQ8k/rrudjV1hZ7XqBks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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