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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dbd6c50e706f0aaaafbb7899e6143e3075212606a0c45936bd4e25f9c770e7' 
  AND token = 'UUVQiy7LNPk/k4x/5BN2S9P+O4UOUAraP68lsm2av9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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