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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc7a4dc4f4f32ebcf29bdab5c44d97e8257381acbcda592b917bb8c8c53a147' 
  AND token = 'E6thMSHvaDSk2PnSzcuMvFE5ym2C0ofoY5uby5DNrd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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