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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0dcecf5e2afd5b014de592bbea30857743194bd2f6fc619db90bae8d7f37604' 
  AND token = 'cvMvEWgbSFYE0Pq2wnotkLTzmDeW5xV1bocITfqtruw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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