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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad4c39a31ce3d56c1413f806224e14887f7e606cfedc92ec60d95bd7f7e0015' 
  AND token = '0S9fVF0ezhvX+USRlbi7cb2JVDiDwfff2xZX/48Psig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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