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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34df1c6c985442512f8ee6b6bec1feb85a9e93bc02b723467039696c23ed2a2' 
  AND token = 'UouBv0FmVq2n3WY5+jb+l0LsgocOl50WshaZ80HRGDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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