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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6263a07cab04f709a930260885d4575188942820f3d3161e3dec3bba527ae62d' 
  AND token = 'yMzB3/4JM8lC3KmOb3jEGSJu2QuHW7m8DtUnvfuDFlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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