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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a0193e518ab87f0d68101f96751e6ccea5c2cd10ec0de09a71407b4338bc52' 
  AND token = 'M/ET805YhcareeOUv7TtE3vSqSvmDVavuTNpBQleTH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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