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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502a4c2a4e0b2c3aef1c9374488233c09f841f8f3da95299acdc934056c96ef1' 
  AND token = 'CIMWqOWHXVNN86O4FMxWQd8I0vZk1PaQBCZ42JWeVQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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