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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8096300453b8fcc13b84d797938588f238c60eab97e33daafe21df1935d213c5' 
  AND token = 'dXXWiHJ7ik9btbHEoI/yF/3AkhyLN9saFmXCzOzm4S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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