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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2aa84a9898b6f14bd8c773109ae62602cf016ca4f2bda1fbfad19d900e4dfab' 
  AND token = 'F01fKRBIfU2sXcWVnac+Z8+PlT9ZmW2WLEv3D0Qi5Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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