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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18668fabac6db187487f7e3d6f85b4d2ac62eaeb706d77e13dacc4d57bb11901' 
  AND token = 'g61P7cVXMwBvEnGmNSbOKhtbha0+aX+8OJEGYFUyGzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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