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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b93b6781d0d4da92d895fe5aaab0ced1ca67b2c728eff03fc1f2d9b5d3298c' 
  AND token = '5oMZlvn6mdA8ncca8OkvNNziWjlukxo95l4ms/3zzck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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