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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4c4b1b903278e010c487f0fc966348e668b94c67bb4537409bd29ab45b44fe' 
  AND token = 'b3N6liANb2oH+QQFiRCanrcrzbrR1YFWJGrfQlYoK5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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