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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07cc682e30299151f23cf0af95b7f6e68b9965f2b401d5f953388b4ff6bdeff' 
  AND token = 'EsDerWRdStaiVSfFYXDiooyuDQArNcYznvHvVi5Egqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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