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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a5d34064448c1aa3dd9a525ed2172563a117e91a980c3f835bb11910ba0f1d' 
  AND token = 'bmWxuSTivXXoQ4MJZTZsORZmfc+Cx7B8Z6bigrKXYco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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