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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f855110e07a7dd0d22f0f59d560e4dee07b4bafb724ebc2fb4cd5d8ec28f7b5' 
  AND token = '/kLy969Lc1+pfsvWeEt9duzPQwuxTpim1Gq+jfgo7tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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