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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20a883088d640db1923dc703ebe4a64d8e5bfdc8492ebc5de36fb3952e80bf1' 
  AND token = '15UonBPH2kBMLW1Z6oDHFYq8swkOEJ8KW48W70TsO/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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