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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b611c33f6c374e36bafffb10d18147656a16bb1abc5d8f73d318b95f9d1addb' 
  AND token = 'wfsbbiNFWaB/420RBJKiOI94Yj/Nbco2qeeD4sjm0Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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