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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808a7ac4c882349a5f2441bc3393e6f443f2550ca3d49de459855ddd6988abee' 
  AND token = '1gWi/V6HpHbJp9x1YGwLw5STPhbcK1UD7a7bXuSNiXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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